(US4794058-A)      The reserve battery, comprises a battery cell compartment defined by housing walls surrounding a number of battery cells and an electrolyte reservoir containing pressurised electrolyte fluid. An elongate member is formed of rigid material having interior walls defining a closed orifice between the battery cell compartment and the electrolyte fluid reservoir.    The elongate member includes a groove adjacent the orifice to define a frangible portion such that upon angular displacement of the elongate member the elongate member is severed at the frangible portion to open the orifice and allow pressure electrolyte fluid to be conveyed through the orifice to the battery cell compartment.    (US4925750-A)      The reserve battery comprises a battery cell compartment defined by housing walls surrounding battery cells and having an open top. A lower bulkhead member spans the open top of the battery cell compartment and has fill tubes depending from a downwardly facing surface of the lower bulkhead member, one fill tube being provided for each of the battery cells. Each fill tube has internal walls defining a passageway between the interior of the battery cell compartment and an upwardly facing surface of the lower bulkhead member.    An upper bulkhead member has a downwardly facing surface opposite and spaced apart from the upwardly facing surface of the lower bulkhead member to form a bulkhead cavity. An elastic reservoir bag in an expanded state contains an electrolyte fluid under pressure, having an opening connected to a passageway to the bulkhead cavity. The passageway between the reservoir bag opening and the cavity can be sealed. Housing walls define a containment for the reservoir bag.    USE -   Portable reserve car battery usable as back-up for stranded motorist. @(8pp)@    (GB2206727-B)      A reserve battery, comprising: a battery cell compartment defined by housing walls surrounding a plurality of battery cells; an electrolyte reservoir containing pressurised electrolyte fluid; an elongate member formed of rigid material having interior walls defining a closed orifice between the battery cell compartment and the electrolyte fluid reservoir; and the elongate member including means adjacent the orifice to define a frangible portion such that upon angular displacement of the elongate member the elongate member is severed at the frangible portion to open the orifice and allow pressurised electrolyte fluid to be conveyed through the orifice to the battery cell compartment.    (BE1004931-A4)      The reserve battery comprises an electrolyte reservoir communicating with individual cells. The reserve battery may be used to recharge a vehicle primary battery through use of the cigar lighter circuit. An elastic reservoir bag in an expended state containing an electrolyte fluid and is connected by a passageway to a bulkhead cavity.    A hook is provided to both lock the activating knob and support the reserve battery during the charging process, which will take approximately 10 minutes. The delivery of current is regulated to prevent excessive current from blowing the fuse in the cigar light circuit.    ADVANTAGE -   Does not need regular recharging.    (JP2761216-B2)      The reserve battery comprises an electrolyte reservoir communicating with individual cells. The reserve battery may be used to re-charge a vehicle primary battery through use of the cigar lighter circuit (16). An elastic reservoir bag in an expended state containing an electrolyte fluid and is connected by a passageway to a bulkhead cavity. A hook (18) is provided to both lock the activating knob and support the reserve battery during the charging process, which will take approximately 10 minutes.    The delivery of current is regulated to prevent excessive current from blowing the fuse in the cigar light circuit.    ADVANTAGE -   Does not need regular recharging.    (DE3823298-C2)      The reserve battery comprises an electrolyte reservoir communicating with individual cells. The reserve battery may be used to re-charge a vehicle primary battery through use of the cigar lighter circuit (16). An elastic reservoir bag in an expended state containing an electrolyte fluid and is connected by a passageway to a bulkhead cavity. A hook (18) is provided to both lock the activating knob and support the reserve battery during the charging process, which will take approximately 10 minutes.    The delivery of current is regulated to prevent excessive current from blowing the fuse in the cigar light circuit.    ADVANTAGE -   Does not need regular recharging.